I need help identifying a deficiency

[Educatedbystoned]

Anyone have an idea what this could be?
Week 8 autoflower. Just started showing signs

 

[Sunin]

calcium

Cannabis Calcium Deficiency: Fixing Your Sick Marijuana Plant

A calcium deficiency in cannabis causes the marijuana leaves to curl and develop brown spots that darken and spread across an entire cannabis leaf. Shoots can also appear yellow or purple. There are many ways to fix a calcium deficiency, read all about how to fix it here.

www.marijuana-seeds.nl

 

[Beachbumm]

What's your medium?
What are you feeding it, and what's your pH and PPM of what you're feeding?

 

[ArtfulCodger]

Looking at the plant next to it, I doubt there's too little of anything in the pot. I see signs of over-lighting (edge curl, circled red), over-feeding (burned tips, circled blue), and over-watering (leaf texture, circled green).

 

[Educatedbystoned]

Looking at the plant next to it, I doubt there's too little of anything in the pot. I see signs of over-lighting (edge curl, circled red), over-feeding (burned tips, circled blue), and over-watering (leaf texture, circled green).

The ppfd is fine but the last 2 weeks have been real hot where I’m from. That’s likely the cause of those stressing. The burn is because I been pushing it with bloom nutrients the last 2 weeks. The heat didn’t help.. what is causing the purple?

 

[Educatedbystoned]

What's your medium?
What are you feeding it, and what's your pH and PPM of what you're feeding?

Ocean forest, mixture of general hydro floraseries and grow ganica incredible bulk bloom booster + calmag+ silica
Ph is 6.3

 

[Educatedbystoned]

Why is this purple? Could it need more phosphorus? Maybe magnesium? Manganese?

 

[ArtfulCodger]

The ppfd is fine but the last 2 weeks have been real hot where I’m from. That’s likely the cause of those stressing. The burn is because I been pushing it with bloom nutrients the last 2 weeks. The heat didn’t help.. what is causing the purple?

My first guess is the light outrunning the magnesium uptake, but it could also be genetic or a function of the fade. There are a lot of ways to grow, but I don't put much stock in "correct" ppfd. When I see light stress, I turn down the light. Your mileage may vary.

 

[Beachbumm]

Why is this purple? Could it need more phosphorus? Maybe magnesium? Manganese?

Is it a purple strain?

Raise pH to 6.8

What's your runoff measurements?

 

[Educatedbystoned]

Not a purple strain, it’s cream cookies by 42fastbuds, I have this second plant that also has signs of burn and heat stress / light stress due to the temps the last 2 weeks I assume.

The purpling isn’t seen on this one though. Same feed

 

[Sunin]

that purple can be going from buds as colour

Buy Cream Cookies Auto Cannabis Seeds | Fast Buds

An iconic strain that is easy to manage throughout the grow process. Cream Cookies auto seeds produce an indica dominant bud with a smooth, cookie flavour.

2fast4buds.com

enough to go where you bought it and look at their pictures it's a colourful strain after all